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How often you take B12 pills and get B12 shots also differs

If you do need to supplement, the next question is: what sort of supplement should you take

Certain populations face elevated risk of developing very high serum B12 levels, though true toxicity remains rare even in these groups

A: Yes legal to purchase as a research chemical for laboratory use

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[4] Functions [edit] This vitamer, along with adenosylcobalamin, is one of two active coenzymes used by vitamin B 12 -dependent enzymes and is the specific vitamin B 12 form used by 5-methyltetrahydrofolate-homocysteine methyltransferase (MTR), also known as methionine synthase